Safety
Admixtures
Concrete Knowledge
QC
Truck Knowledge
100
What are the standard PPE items that should worn by a professional mixer driver?
100
Chemical ingredients added to improve concrete performance.
What are admixtures?
100
The powder that reacts with water to bind aggregates together.
What is cement?
100
What is a slump test.
100
Front Discharge/Rear Discharge/Paddle/Volumetric/
What are examples of concrete delivery trucks?
200
The system used to prevent accidental startup of machinery during maintenance.
What is lockout/tagout?
200
This admixture introduces tiny air bubbles to help concrete survive freeze-thaw cycles.
What is an air-entraining admixture?
200
cementitious material/water/coarse & fine aggregates
What are the 4 primary constituents in a concrete mix design?
200
The chemical process where cement reacts with water and hardens.
What is hydration?
200
Steer 4/32 Drive 2/32
What are the minimum tire tread depths when performing a Concrete Mixer inspection?
300
Slips, Trips, and Falls
What is the most common RMC workplace injury/incident?
300
When using air-entraining agents, this is the typical recommended percentage of air by volume for durable concrete.
What is 5% to 7%?
300
Flyash/Calcium carbonate/Silica Fume/Calcined clay/Calcined shale/Rice husk/Ground Granulated Blast Furnace Slag (GGBFS)
What are Secondary Cementous Materials (SCM)?
300
150#
What is normal weight of concrete per cubic foot?
300
The term for the maximum time allowed between batching and discharge.
What is 90 minutes (typical ASTM guideline)?
400
Wet concrete is highly alkaline and can cause these, ranging from mild to severe.
What are cement burns (alkaline burns)?
400
These are specialized, highly efficient water-reducing agents that produce "flowing" concrete without excessive water.
What are Superplasticizers (High-Range Water Reducers)?
400
The process engineers use to determine the correct proportions of materials in concrete.
What is concrete mix design?
400
Numbers used to measure how smooth and level a concrete floor is.
What are FF and FL #'s in concrete finishing?
400
The direction the drum spins to discharge concrete.
What is counterclockwise rotation (discharge direction)?
500
This severe, irreversible lung disease is caused by breathing in silica dust.
What is Silicosis?
500
This type of chemical is used in parking structures to prevent corrosion of reinforcing steel.
What is a corrosion inhibitor?
500
Joseph Aspdin (25 December 1778 – 20 March 1855) was an English bricklayer, businessman, inventor, and stonemason.
Who is credited for the creation of the modern Portland cement process.
500
The most damaging ingredient a mixer driver can control the addition of.
What is water?
500
The device built into a mixer drum to unload concrete.
What is an archimedes spiral?